文献类型：期刊文献

英文题名：Experimental Investigation on the Effect of Volume Loss on Ground Movements Induced by Tunnelling in Sand

作者：Wang, Tianzuo[1];Wang, Ruipeng[1];Xue, Fei[1];Tang, Ningbo[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China

年份：0

外文期刊名：KSCE JOURNAL OF CIVIL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000874428800001)、、EI(收录号：20224413037078)、Scopus(收录号：2-s2.0-85140831911)、WOS

基金：The authors would like to acknowledge the financial support for this study provided by the National Natural Science Foundation of China (Grant No. 41831290), and the Natural Science Foundation of Zhejiang Province (Grant No. LGJ22D020001 & No. LQ20E080006).

语种：英文

外文关键词：Underground tunnelling; Physical model test; Ground deformation; Digital image correlation

外文摘要：Complex ground conditions or support failures during tunnel construction can lead to high ground loss, which may cause damage to surrounding structures. In this paper, a series model tests are carried out in order to clarify tunnelling-induced ground deformation at high ground loss conditions. The model tunnel in this test is shallowly buried in loose sand and the tunnel volume loss (V-l,V-t) is set from 4% to 10%. The V-l,V-t is controlled by a water-filling-drainage system and the ground deformation is monitored by digital image correlation (DIC) system. The results show that the Peck-Gaussian function can be used to fit the settlement data well, and the increase of V-l,V-t has no significant effect on the width of the settlement trough, while the horizontal displacement can be described by modified empirical method. The width of influence aera caused by tunnelling decreases linearly with depth, and the width near the tunnel crown is about 78% of that on the surface. For loose sand ground, it is the shear band rather than the soil arch that dominates the ground deformation. Furthermore, excavation leads to a volume contraction of the ground, which suggests predictions based on tunnel over-excavation trend to underestimate the ground deformation, and that should be taken seriously in consideration of the safety of the engineering project. This study can provide a better understanding of ground deformation induced by tunnelling.